Estudos florísticos e fitossociológicos na restinga do Crispim-PA.

Abstract

The sandbank of Crispim is located between the geographic coordinates 47°40'24" and 47°38'00" WGr.; 00°37'06" and 00°34'42", in the municipality of Marapanim, Pará State. Six plant communities are represented in this restinga: Halophilous, Psammophilous Reptant, Herbaceous Brejo, Stable Dunes, Field between Dunes and Restinga Field. This paper deals only with the first three communities, located between the beach and the mangrove. For the phytosociological studies, the square method (Muller-Dombois & Ellenberg, 1974) was employed for the Halophytic and Herbaceous Brejo Herbaceous communities and the point method (Mantovani & Martins, 1990) for the Reptant Psammophilous community. The Halophytic community, situated just beyond the streambed zone, is represented by 3 species, cited according to their Importance Value Indices (IVI): Sesuvium portulacastrum L. (83.82%), Sporobolus virginicus L. (61.12%) and Iresinevermicularis (55.05%). The Psammophyllous-Reptant, occurs on the first dune cordon, and in this community the species that presented the highest IVI's were: Paspalum vaginatum Sw. (156.90%) and Canavalia rosea (Sw.)DC. (89.97%). The Herbaceous Brejo located on the reverse side of the first dune cordon presents a greater diversity with 12 species distributed in 7 families, where the species with the highest IVI's are Fimbristilys spadicea Vahl. (57.71%), Paspalum vaginatum Sw. (54.25%) and Sporobolus virginicus L. (51.22%).